Very late to this, but wow. SG has always seemed to me to be someone who isn't all that bright or well-informed, but doesn't grasp how much there is that she doesn't know. Used to work in IT but as far as I know she isn't a graduate, has had no training or high level experience in management, HR, finance, safeguarding or charity administration, so must have been massively out of her depth as Mermaids grew so fast in recent years. The IT leak a few years back was inexcusable and happened in her one and only area of expertise.
Did she appoint the Trustees? Surely others must have had some involvement there as well? I can believe she appointed the egregious Mew, though, and from the look of that tweet screenshot above probably sacked him when his photos became public.
She has been influential in WPATH, see screenshot, so has had influence well beyond these shores. I also saw someone on Twitter claiming that Helen Webberley has said she turned to SG for advice on transing children. That reflects extremely badly on both of them if true. SG should know that as she has no knowledge or training as an HCP or in psychology or any relevant academic discipline she should never have been trying to advise an HCP how to treat a particularly vulnerable patient.